Grid or riddle for sifting minerals, coal, and other materials



June H2, 1923. I 11,458,299

A. JACQUELHN -G5RID OR RIDDLE FOR SHIFTING MINERALS, GOAL, AND OTHER MATERIALS Find 090 38, 1921 2 Sheets-Sheet 1 nun A uni lime 112, 1923. 3,458,299

A. JACQUELIN GRID OR RIDDLE FOR SHIFTING MINERALS, COAL, AND OTHER MATERIALS Filefi Dec. 28. 1921 2 fiheets-Sheet 2 ammnm w win Patented June 12, 1923.

' nniran as ARMANI) JACQUELIN, or rams, raancn.

GRID OR RIDDLE FOR SIFTING MINERALS, COAL, AND OTHER MATERIALS. f

Application filed December 28, 1921. Serial No. 525,437.

To all whom it may concern:

Be it known that I, ARMANI) JACQUELIN, citizen of the Republic of France, residing at 11, Avenue Pasteur, Paris, France, have invented certain new and useful Improvements in or Relating to Grids or Riddles for Sifting Minerals, Coal, and Other Materials, of which the following is a specification, reference being had therein to the accompanying drawing.

My invention relates to grids or riddles for sifting minerals, coal and other materials.

According to this invention the grid or riddle is constituted by a continuous metallic wire, wound around a frame. then stretched, the upper strands of this wire be ing arranged in a certain number of planes parallel with each other, and the lower strands being connected in bundles of two or more.

A grid or riddle according to this invention is represented by way of example in the accompanying drawing in which:

Figure 1 is a partial top plan View of the grid or riddle, the lower strands of the wire not being shown.

Figure 2 is a section of the frame with a plan view of the lower strands of the riddle.

Figures 3 and 4 are a longitudinal elevatlQI and a side elevation respectively of the an Figure 5 is a partial longitudinal section of a modification of the frame.

The sifting grid'or riddle is formed by a continuous steel wire 1 of high elastic resist mice, subjected to a high tension, after being rolled around an extensible metallic frame constituted by two steel bars 2, of round cross-section or having rounded edges, connected together by a sufficient number of stretcher bolts 3. The two ends of the wire are strongly secured by being firmly clamped for example between one of the bars and the single or double nut of a screw-threaded stud 4.

The position of the strands of the wire on the frame is exactly determined by two series of notches 5, 6 uniformly and suitably spaced apart, and made in the upper and lower faces respectively of the bars 2 and in which notches the wire lies. The whole of the upper strands 7 of the wire constituting the grid proper.

The lower strands S are connected to-- gether in groups of two or more, inthe notches 6 and each of these groups of strands is clamped into a bundle by certain runners 9 of annealed steel wire. This special arrangement of the lower strands has for its 6 object to afford afree passage to the products which have passed through the riddle without obstruction. I

The upper strands may be arranged in one and the same plane as shown in Figures 1 at It is obvious that series of notches 5 may be provided, the various notches of one and the same series being of difierent depths. In this case the upper strands are arranged 7c in planes which are parallel with other, and equal in number to the number of notches in one and the same series. For

example the notches 5 may have alternately two different depths (see Figure 5) in which is case the upper strands of the steel wire are in two planes parallel with each other.

In order to facilitate the exit of the prodnot to the front end of the riddle the corresponding bar 2 has fixed on it a strip of 8 strong and possesses great sifting capacity W by reason of the relative size of the gaps with respect to the solid parts.

It offers no serious risk of obstruction, even when the strands are very close together by reason of the elasticity of the metal of the wire combined with its tension.

For this latter reason there is no longer any reason to fear any permanent change of shape in the wire which would bring about appreciable variations in the gaps separating the strands.

This sifting grid is of particular value for the removal of dust from any kind of raw material, particularly when it is damp. It

is of great use even when erected in a stationary form, but it gives the best results when it is combined with an oscillating sieve, particularly when the oscillations are of high frequency.

The direction of the wires may be that of 1 the advance of the products to be sifted or may be at right angles or even obl1quely thereto.

The particular arrangement of the grid with wires at alternate levels also increases 1110 the separating power of the grid and facilitatefs the easy elimination of flat in a categoryof products of any kind, premetal wire wonndaronnd aframe and then viously classified in diameter on perforated metal sheets. "This special operation is of use in particular when applied to the double preliminary classification"(in diameter and thickness) of minerals and fuels before they are washed, and in the mechanical re moyal of stone from coals when the greater of the schists is in a moreor less'flattened c m a a 1. A siftmg grid compris ng a continuous formias is very frequently the case. v

stretched the upper strands of the wire bei g arranged inajcertain ni mber of parallel planes and the lowenstrandsof the. wire being connected in bundles of two or more.

Afsiftin g' gridcomprising a continuous metal wire an extensible frame constituted by two bars provided with notches and by connecting cross bars a'ctingas stretcher's,

each noth of the upper face of the bars corresponding to T an 'upper strand of the wire a j and each notch of the lower facecorresponding to several lowerstrands of the wire, connected together bybinders suitably spaced apart.

3. A siftinggrid according to claim 2 in which all the upper'strands of the wire are 

